A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Home to items never before seen by the public.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The National Park Service’s best-kept secret with views that rival any in D.C.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

French prisoners carved these boats from the bones of their meat rations.

This museum is a music lover's introduction to the iconic venue.

A wall of chewing gum moonlights as collective art.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

The city's oldest Chinese restaurant offers local history and seriously good food.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A large AIDS Memorial Pathway art installation provides a moment for quiet contemplation in this public park.

With its vaulted ceiling and gilded details, this University of Washington library would feel right at home inside an old palace.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

This former coal gasification plant found a curious second life as a popular public park.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

A giant Troll lurks under one of Seattle's oldest bridges.

A nondescript Seattle restaurant inherited a piece of European history.

A museum dedicated to the history and exploration of both popular music and science fiction.